Molar Mass WS
Name _________________________
Date ________________ Period ___
Find the Molar masses of the following:
1.
Argon –
9.
BF3
2.
Bromine –
10.
Mg(OH)2
3.
Sodium hydroxide –
11.
Copper(I) oxide –
4.
Calcium Carbonate –
12.
Pb(NO3)2
5.
H3PO4
13.
Phosphorous Pentachloride -
6.
Hydrogen Bromide –
14.
Zn(C2H3O2)2
7.
Aluminum Sulfate –
15.
Ammonium nitrate –
8.
Nitrogen Dioxide –
16.
(NH4)2SO4
Name ________________________
Date ______________ Period _____
Molar mass of a Compound: mass of a compound ↔ moles of a compound
The chemical formula of a compound indicates the ratio of each element within the compound and
therefore the number of moles of each element. The molar mass of a compound is the sum of the molar
masses of all the particles that make up the compound.
Questions:
1. Given the two diagrams of a methane molecule and a trichloromethane molecule, answer the
following questions:
A. What elements and how many atoms of each are
in methane?
B. What elements and how many atoms of each are in
tri-chloromethane?
C. How many moles of each element are in 1 mole of
methane?
D. How many moles of each element are in 2 moles
tri-chloromethane?
2. Calculate the molar mass for the following:
A. Chlorine
B. NaNO3
C. AgCl
D. Pb(NO3)2
E. Copper (II) Bromide
3. Use the information you calculated above to determine the number of moles of Silver Chloride in
a 500g sample.
4. How many molecules of Silver Chloride are in that 500g sample?